protected function check($receipt, $url = null)
{
$url = empty($url) ? self::PRODUCTION_API : $url;
$request = new URLRequest($url);
$response = $request->postJSON(array('receipt-data' => $receipt), false);
if (isset($response->status) === false) {
throw new NonFatalException('invalid receipt', 400);
} else {
if ($response->status != 0) {
if ($response->status === 21007) {
$response = $this->check($receipt, self::SANDBOX_API);
} else {
throw new NonFatalException('invalid receipt - ' . $response->status, 400);
}
}
}
return $response;
}
